Timeline errors in some srt files

[okizen]

I have some .srt files with the timelines written either as

00:00:06,354 --> 00:00:30.105 instead of 00:00:06,354 --> 00:00:30,105

OR

00:00:06,354 --> 00:00:30105 instead of 00:00:06,354 --> 00:00:30,105

and these errors continue throughout the subtitle file.

Is there any app that will let me batch correct these or will I have to manually correct them line by line? I'm a mac user.